If you choose "change cards", do you really get a whole new set of cards, or is the software, as I suspect, only rotating the ones you actually get initially? Since you can't see all of the cards that show up automatically to choose from prior to purchasing them, is there any way to determine if you are actually getting a new set?

I ask because if the card generator is being manipulated to give the 'winning' card odds to a specific player, how is that changed (if it even IS) by you choosing 'new cards'?

Because I do beleive that card manipulation and distribution is at least one key factor in determining winners, I do think you may get "new" cards...all coming from the lot of cards that are considered least likely to win, if you are not destined to be a probable winner.
There can be an infinite number of cards. Never mind the fact that you are the only one that sees the cards you are getting, and how do you know that there are not many copies of "bad" cards in your lot. Do you really have time to check that out when purchasing?
Lives there a site so moral and fair they they would refuse an option to "assist" a loyal player or big depositor in winning? Or to give a boost to a newbie to encourage further depositing and referring friends to the site?
Or to be able to have a bit of control on the distrbution of wins to aid in player retention? After all, if it is a standard and acceptable option within the software industry, who is to feel guilty or even think they are not operating within acceptable guidelines and are free to proclaim "fairness" and transparency.
Just as with the normal procedure of sites being able to have the last word on any issues regarding playrs rights...this is a given within the online gaming idustry. Is it right or fair? NO, but it is a universal code that is shared by all sites to prevent authorized third party intervention or monitoring. I do think that card control is a trade secret device that is used naturally,guiltlessly and without recrimination or deviation from what is considered a fair proposition for the depositing player by all site management. How is it the same winner syndrome is at every site? Find me a site that does NOT have a significant group or person winning regularly,month after month, and youwill have shown me an operator that has not included some "tweek" to promote site revenue.
For every site out there, the bottom line is control with luck playing a very small part in any outcome. When I start seeing a fair distribution of wins, excluding actual "lucky streaks", overall within bingo gaming, I will have found an operator that is willing to do as every player does...take a gamble!

I normally do play multiple rooms simultaneously. Say Room 1 has a coverall hour special going on, but rooms 2 and 3 and 4 also have a couple of special fixed pot and/or coveralls playing each hour as well....I will consistently play Room 1 for every game, but only play the specials in the other rooms when they are shown, so those rooms will get their windows resized so I can watch all four rooms at the same time while playing Room 1 and wait for the other three rooms to announce the specials.

I lose far more frequently than I win no matter where I play, no matter whether I max out or not, and no matter how many rooms I play in....sometimes winning alone enough to keep me going for a while longer, most times splitting a game tho while the 'frequent' winners invariably win alone most of the time.

I played at a site just two days ago (starting Friday evening)....watched three rooms simultaneously, and the rooms were $1, $.25, and $.10 price tags. Quarter room had an hour special going on while the other two rooms were 'normal' games with an occasional special game during that hour.

Dollar room had at most 10 people playing every game, Quarter room had 31 people playing, and Dime room had 21 people playing....TWO people won nearly every game (or even split with each other, sometimes with others) in ALL THREE ROOMS during the hour I was there. One of those people is on their home page in the December highest winners lists.....and yet playing at various times over the last two days since that hour of play, I haven't seen either one of them enter a game, play out of chat, or win anything since.

But, if you look at the 'more winners' link, at least SEVEN of those listed HIGH money winners have won repeatedly in the last two days.

$300 deposited in two days at the site and I zeroed out, including bb's, by 10AM this morning. Yeah, land bingo definitely is looking better and better to me. lol

Yes, of course , it is all speculation at this point.
the amount of money a player spends though, over a given time period, may increase chances of winning because of the TIME spent playing, and nothing more. It should not increase the chance on any individual game.

When I step into a room and purchase cards, especially a same number
of cards per person room, my chance of winnng should be equal to anyone else playing. The software should not be factoring in the time or money I have invested in the game. How many hours you spent playing before this game started should have NO bearing on the outcome of a single independent event. When I see the same people winning under these circumstances, something tells me this person is having a lucky streak or the cards are manipulated. When I spend an hour playing alongside the person(s) that is winning constantly, my hour is just the same as theirs, my money is just as equal and my chance of winning should be equal. I, personally do not care how long they have been there or how much they have spent, and neither should the software.
Sure, if you check out a 6 month reconcile of players there will be a dfference if one plays 6 hours a day and one plays 6 hours a week. The overall amounts of wins and losses will be much more with the time investor. But observing any given day with a player that is considered a big spender by the site, should certainly not maximize the possbility of winning during that time frame when playing shoulder to shoulder alongside other roomies IF all variables are equally distributed.
I say every single bingo game is an independent event that should not hinge on a players history of wins or losses and provide a fair opportunity for every player to have the same odds of winnng. When I see the same person winning repeatedly while I am in the room playing
also, I have to wonder what makes his time or money more valuable than mine? What is increasing his odds at this particular time? Luck? Maybe..until it becomes a repeated event...day after day.